Name:	sgy_AcquisitionsAndDivestituresTextualAbstract
Namespace Prefix:	sgy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Business acquisition cost of acquired entity purchase price additional interest.

+ References

No definition available.

+ Details

Name:	sgy_BusinessAcquisitionCostOfAcquiredEntityPurchasePriceAdditionalInterest
Namespace Prefix:	sgy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Business acquisition purchase price allocation asset retirement obligations.

+ References

No definition available.

+ Details

Name:	sgy_BusinessAcquisitionPurchasePriceAllocationAssetRetirementObligations
Namespace Prefix:	sgy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Business acquisition purchase price allocation proved oil and gas properties.

+ References

No definition available.

+ Details

Name:	sgy_BusinessAcquisitionPurchasePriceAllocationProvedOilAndGasProperties
Namespace Prefix:	sgy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Business acquisition purchase price allocation unevaluated oil and gas properties.

+ References

No definition available.

+ Details

Name:	sgy_BusinessAcquisitionPurchasePriceAllocationUnevaluatedOilAndGasProperties
Namespace Prefix:	sgy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Cash consideration from sale of significant properties.

+ References

No definition available.

+ Details

Name:	sgy_CashConsiderationFromSaleOfSignificantProperties
Namespace Prefix:	sgy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Cost of Leasehold positions acquired.

+ References

No definition available.

+ Details

Name:	sgy_CostOfLeaseholdPositionsAcquired
Namespace Prefix:	sgy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Estimates asset retirement obligation.

+ References

No definition available.

+ Details

Name:	sgy_EstimatesAssetRetirementObligation
Namespace Prefix:	sgy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Leasehold interest divested.

+ References

No definition available.

+ Details

Name:	sgy_LeaseholdInterestDivested
Namespace Prefix:	sgy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Leasehold positions acquired.

+ References

No definition available.

+ Details

Name:	sgy_LeaseholdPositionsAcquired
Namespace Prefix:	sgy_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

Leasehold positions divested.

+ References

No definition available.

+ Details

Name:	sgy_LeaseholdPositionsDivested
Namespace Prefix:	sgy_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

Leasehold positions Net.

+ References

No definition available.

+ Details

Name:	sgy_LeaseholdPositionsNet
Namespace Prefix:	sgy_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of additional operated working capital acquired.

+ References

No definition available.

+ Details

Name:	sgy_PercentageOfAdditionalOperatedWorkingCapitalAcquired
Namespace Prefix:	sgy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of non operated working capital acquired.

+ References

No definition available.

+ Details

Name:	sgy_PercentageOfNonOperatedWorkingCapitalAcquired
Namespace Prefix:	sgy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of operated working capital acquired.

+ References

No definition available.

+ Details

Name:	sgy_PercentageOfOperatedWorkingCapitalAcquired
Namespace Prefix:	sgy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of operated working capital acquired during period.

+ References

No definition available.

+ Details

Name:	sgy_PercentageOfOperatedWorkingCapitalAcquiredDuringPeriod
Namespace Prefix:	sgy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of ownership interest after additional interest acquisition.

+ References

No definition available.

+ Details

Name:	sgy_PercentageOfOwnershipInterestAfterAdditionalInterestAcquisition
Namespace Prefix:	sgy_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cash paid to acquire the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph f(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(2)-(3)

-URI http://asc.fasb.org/extlink&oid=6909870&loc=d3e1392-128463

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 54

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 55

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph r(2, 3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionProFormaInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionPurchasePriceAllocationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The total purchase price of the acquired entity. This includes cash paid to equity interest holders of the acquired entity, fair value of debt and equity securities issued to equity holders of the acquired entity, and transaction costs paid to third parties to consummate the acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 35

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_BusinessAcquisitionPurchasePriceAllocationAssetsAcquiredLiabilitiesAssumedNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The pro forma income from continuing operations before changes in accounting and extraordinary items, net of tax effect, for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionsProFormaRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Acquisitions and Divestitures (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended							1 Months Ended			6 Months Ended	12 Months Ended	1 Months Ended	3 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 28, 2011	Dec. 28, 2011 BP Exploration and Production Inc [Member]	Dec. 28, 2011 Adjacent Mississippi Canyon Block 29 [ Member]	Dec. 28, 2011 Mica Field [Member]	Dec. 28, 2011 Pompano Field [Member]	Jan. 31, 2011 Pyrenees Project [Member]	Dec. 31, 2011 Wideberth Development Project [Member]	Jan. 31, 2011 Wideberth Development Project [Member]	Dec. 31, 2011 West Virginia Leasehold [Member] acre	Dec. 31, 2010 Appalachia [Member] acre	Apr. 30, 2010 Marcellus Shale [Member] acre	Dec. 31, 2011 Main Pass Block 296 and 311 [Member]	Dec. 31, 2010 Main Pass Block 41 Field [Member]	Mar. 31, 2010 Main Pass Block 41 Field [Member]
Allocation of the recorded value of net assets acquired in the transaction
Proved oil and gas properties			$ 208,680
Unevaluated oil and gas properties			17,314
Asset retirement obligations			(58,363)
Total fair value of net assets			167,631
Pro forma of financial information
Revenues	1,007,376	799,461
Income from operations	392,054	243,387
Net income	242,118	141,763
Basic earnings per share	$ 4.95	$ 2.93
Diluted earnings per share	$ 4.95	$ 2.92
Acquisitions and Divestitures (Textual) [Abstract]
Percentage of operated working capital acquired				75.00%	51.00%
Percentage Of Non Operated Working Capital Acquired						50.00%	75.00%
Cash Consideration Transferred			167,631
Percentage Of Additional Operated Working Capital Acquired								15.00%
Percentage of operated working capital acquired during period										25.00%
Ownership working interested								30.00%
Cost of additional non operated working capital acquired								14,974	31,000
Estimates asset retirement obligation									1,078					10,900	632
Leasehold positions Net											10,000
Leasehold positions acquired											6,700	26,000
Cost of Leasehold positions acquired											19,000	74,334
Sale of interest cash consideration														80,381		5,500
Leasehold positions divested, area													7,000
Leasehold interest, divested													$ 30,315